Method for on-line hot replacement of flow channel lip brick of float ultra-thin electronic glass

Abstract

The application discloses a kind of methods for replacing flow channel lip brick in hot state on line of float ultra-thin electronic glass, and belongs to the technical field of lip brick replacement.The technical scheme is: drop 1# gate, and carry out head son;0 bead is lifted upward, and the whole lip brick is translated to the direction of tin bath;2# gate is lifted out, and the lifting device of 2# gate is removed;The residual glass liquid of tin bath front beam brick to lip brick tongue is cleaned;0 bead is lifted out, and old lip brick is lifted;The glass that is adhered to the bottom and side wall of flow channel, the connection of flow channel and lip brick is removed, the distance between the two inner walls of flow channel is measured, and the center line of flow channel is determined;New lip brick is lifted;0 bead is lifted;Lip brick is heated;0 bead is restored, the lifting device of 2# gate, 2# gate and pressure strip brick, cover joint brick are installed.The method of the application can systematically replace lip brick in hot state, so that the replacement process is safer, more stable and minimizes loss, and effectively ensures the finished product quality of production line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lip brick replacement, and particularly relates to a method for replacing a flow channel lip brick in a hot state in an on-line float ultra-thin electronic glass production process. BACKGROUND

[0002] In a flat plate float glass production process, a melting furnace, a tin bath and an annealing furnace are three main thermal equipment. A flow channel is a connecting channel of the melting furnace and the tin bath, and is composed of a flow channel and a lip brick, and the entire flow channel has an inverted V-shaped structure. The flow channel is composed of a steel structure, high-aluminum light-weight insulation bricks, clay bricks and alpha-beta electrically fused corundum bricks, and the lip brick is composed of a lip brick bracket, mullite cushion bricks, alpha-beta shoulder bricks, alpha-beta face bricks and alpha-beta tongue bricks. High-temperature glass liquid in the melting furnace continuously flows into the tin bath through the flow channel, floats on the high-temperature molten tin liquid, is spread and polished, is thinned and thickened by a edge roll and a main drive, and flat plate glass with a qualified thickness is cut, packaged and cooled at a cold end after passing through the tin bath and entering the annealing furnace.

[0003] Ordinary glass and ultra-thin electronic glass have great differences in production parameter control due to different quality requirements. The temperature of the glass liquid of ordinary glass flowing through the lip brick is about 1100 DEG C, and the temperature of the glass liquid of ultra-thin electronic glass is about 1290 DEG C. Since the lip brick is directly impacted by the high-temperature glass liquid flow and is located at a gas-liquid-solid three-phase junction, the lip brick is easily eroded by the glass liquid. Once the lip brick is eroded, even if the damage is small, it will cause defects such as a line, a glass tendon and a bubble on the glass plate, and seriously affect the production quality of the glass. At the same time, the quality requirement of the ultra-thin electronic glass is much more stringent than that of the ordinary glass, so the alpha-beta corundum lip brick can be used for about 7-8 years in the ordinary float glass production line, and can be replaced basically when the production line is cold repaired, so the cold replacement method is generally used. However, the alpha-beta corundum lip brick can be used for only about 3-4 years in the ultra-thin glass production line, and cannot be replaced when the production line is cold repaired in order to ensure the product quality, so the hot replacement method needs to be used to reduce the loss of the ultra-thin glass.

[0004] The lip brick is a customized product, and the manufacturing cycle is about 1-3 months, and the price is different from 200-300 thousand yuan. Therefore, in order to control the cost, only one spare lip brick is generally used in the ultra-thin glass production line. If the spare lip brick is damaged when the lip brick is replaced, a new lip brick needs to be ordered, which will cause the quality of the glass product to be seriously reduced during the manufacturing cycle of the lip brick and cause great loss.

[0005] The utility model discloses a CN216945915U discloses a kind of replacement lip brick support's hanging beam device, including hanging beam component and the support component of supporting hanging beam component, hanging beam component includes crossbeam structure, stringer structure and hanging beam structure, crossbeam structure includes the two main beams of parallel arrangement and the slide rail of being evenly arranged on main beam, stringer structure includes the stringer of parallel arrangement, and stringer slides on slide rail;Hanging beam structure includes the four hanging beams of being arranged at the both ends of stringer, and the fixed lug of slide pulley is arranged in the lower part of hanging beam, and slide pulley is connected by wire between slide pulley.The replacement lip brick support's hanging beam device of this patent is suitable for glass forming process, and only can realize the replacement of lip brick support, and cannot solve the above problem.

[0006] In summary, there is a need for a mature, effective, easy to implement, standardized method of hot replacement of lip brick in ultra-thin glass production line. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a method for hot replacement of flow channel lip brick in float ultra-thin electronic glass online. This method systematically replaces the lip brick, making the replacement process safer, more stable, and minimizing losses, and effectively ensuring the quality of the finished products in the production line.

[0008] The technical solution of the present application is as follows:

[0009] The method for hot replacement of flow channel lip brick in float ultra-thin electronic glass online comprises the following steps:

[0010] S1: Lower 1# gate, and perform head beating; After head beating, remove the electric heating rod of 0B and take out the nitrogen bag at the inlet of the tin bath. Remove the pressing brick and jointing brick between 1# gate and 2# gate, push the cover plate brick between 1# gate and 2# gate and the shoulder brick under the cover plate brick towards 1# gate, and then seal and insulate the gap between 1# gate and 2# gate with thermal blanket to reduce heat loss.

[0011] S2: Lift 0B upwards through 0B rod, so that the distance between the upper end surface of the lip brick bracket and 0B is greater than 500 mm. Remove the connecting bolts and welding points between the lip brick bracket and the flow channel, translate the lip brick as a whole towards the tin bath, and install a pad iron between the lip brick bracket and the tin bath side brick to protect the eight-character brick and backing brick from being damaged.

[0012] S3: Hoist out 2# gate, remove the lifting device of 2# gate, and seal and insulate the position of the original 2# gate of the flow channel with thermal blanket. Cover the hoisted-out 2# gate with thermal blanket to prevent it from exploding due to sudden cooling or heating.

[0013] S4: Clean the residual glass liquid from the front beam brick to the lip brick tongue at the observation window of one side of the tin bath.

[0014] S5: Lift out 0 BETs and begin preparations for the overall lifting of the old lip brick. Check whether the old lip brick is stuck to the octagonal brick and backing brick at the tin bath inlet (if stuck, use hooks or other tools to separate them). After confirming that there is no sticking, lift the old lip brick and check whether the octagonal brick and backing brick at the tin bath inlet need to be replaced. If they do not need to be replaced, protect them and reuse them. Ensure the end face of the connection between the flow channel and the lip brick is insulated.

[0015] S6: Remove the glass adhering to the bottom and side walls of the flow channel and the connection between the flow channel and the lip brick, ensuring that there are no unevenness on the contact surface with the new lip brick, otherwise it will affect the installation quality of the new lip brick; after cleaning the glass, measure the distance between the two inner walls of the flow channel to determine the center line of the flow channel.

[0016] S7: Hoist the new lip brick, level the lip brick itself in the longitudinal and transverse directions, and adjust the gap between the lip brick and the flow channel to be uniform from top to bottom; the connection between the lip brick and the flow channel should not be higher than the flow channel, the center line of the lip brick should be consistent with the center line of the flow channel, and use a frame level to measure whether the lip brick is horizontal. After the lip brick is in place, it should be tightly attached to the flow channel and fixed together with connecting bolts.

[0017] S8: Hoist the 0 shell so that the lower end of the 0 shell is 5-10mm higher than the lip brick bracket;

[0018] S9: The lip brick is heated by the hot air flow in the tin bath, and then the lip brick is electrically heated to gradually increase its temperature; the 0-belt height is gradually reduced according to the temperature rise to control the heating rhythm; the lip brick is checked for any abnormalities every hour during the heating process;

[0019] S10: Restore 0 shell, install the lifting device of gate #2, gate #2 and pressure strip brick, cover brick, seal 0 shell, flow channel, lip brick around, and prepare for the inlet.

[0020] Preferably, in step S1, before lowering gate #1, the proportion of hydrogen in the protective gas at the front end of the tin bath is increased to more than 10%.

[0021] Preferably, in step S4, when cleaning the glass, a small portion of the molten glass is left to cover the exposed molten tin surface to prevent excessive oxidation and contamination of the molten tin.

[0022] Preferably, in step S4, an insulation blanket is installed between the tongue of the lip brick and the front beam brick of the tin bath, and a support is installed below the insulation blanket.

[0023] Preferably, the support member is a cooling water pipe.

[0024] Preferably, in step S8, after hoisting the 0-shell, thermocouples are installed at the connection between the lip brick and the flow channel, and at the tongue of the lip brick. The thermocouples are 5-10mm away from the surface of the lip brick, so as to monitor the temperature rise of the lip brick later.

[0025] Preferably, in step S9, when electrically heating the lip brick, the temperature is first raised to 150°C, then to 350°C, and then to 720°C, with the heating rate increasing sequentially.

[0026] Preferably, before proceeding to step S1, pre-operation preparations are carried out: one month before replacing the lip brick, the lip brick is placed near the flow channel, and the heat of the flow channel is used to heat the lip brick to remove the moisture in the lip brick. When the lip brick temperature is 50℃, it can basically remove all the moisture in one month; after the moisture in the lip brick is removed, the lip brick is assembled on the lip brick bracket, and the electric hoist and other equipment are tested to see if they are working properly.

[0027] Preferably, the thermal insulation blanket is made of aluminum silicate fiber.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] This invention proposes a systematic online hot-state replacement method for flow channel lip bricks. This method makes the hot-state replacement process safer, more stable, and minimizes losses, effectively ensuring the quality of finished products on the production line. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the flow channel structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the online hot-state replacement of the flow channel lip brick of the present invention.

[0033] In the diagram, 1. Flow channel; 2. Tin bath; 201. Front beam brick; 301. Gate #1; 302. Gate #2; 4. 0 shell; 5. Cover brick; 6. Insulation blanket; 7. Lip brick; 701. Lip brick bracket; 702. Lip brick tongue; 8. Figure-eight area; 9. Cooling water pipe; 10. Tin liquid. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0035] Example 1

[0036] The method for online hot replacement of the flow channel lip brick in this embodiment of float ultrathin electronic glass requires the following preparations before operation: one month before replacing the lip brick 7, place the lip brick 7 near the flow channel and heat the lip brick 7 with the heat of the flow channel to remove the moisture in the lip brick 7. When the temperature of the lip brick 7 is 50℃, it can basically remove all the moisture in one month; after the moisture in the lip brick 7 is removed, assemble the lip brick 7 on the lip brick bracket 701 and test whether the electric hoist and other equipment are normal.

[0037] The lip brick 7 was then replaced, including the following steps:

[0038] S1: First, increase the hydrogen content in the protective gas at the front end of the solder bath 2 to over 10% to ensure that the oxidized solder liquid 10 is restored during the replacement process. For example... Figures 1-2 As shown, lower gate 1 (301) and hammer it. After hammering, remove the electric heating rod from 0 shell 4 and take out the nitrogen tank at the inlet of tin bath 2 to avoid damage during the replacement of lip brick 7. After replacing lip brick 7, it can be reinstalled. Remove the pressure strip brick and cover brick between gate 1 (301) and gate 2 (302). Push the cover brick 5 between gate 1 (301) and gate 2 (302) and the shoulder brick underneath the cover brick 5 towards gate 1 (301). Then, use an aluminum silicate fiber blanket to seal and insulate the gap between gate 1 (301) and gate 2 (302) to reduce heat loss. Electric heating rods and thermocouples can also be installed here to achieve temperature control.

[0039] S2: Lift 0B4 upwards using the 0B4 pull rod so that the distance between the upper end face of the lip brick bracket 701 and 0B4 is greater than 500mm. Remove the connecting bolts and solder joints between the lip brick bracket 701 and the flow channel 1. Use a pry bar to move the lip brick 7 as a whole towards the tin bath 2 by 30mm. Add a shim between the lip brick bracket 701 and the side brick of the tin bath 2 to prevent the lip brick bracket 701 from sticking to the side brick of the tin bath 2 and protect the figure-eight brick and the backing brick from damage.

[0040] S3: Lift out gate 2# 302 and remove the lifting device of gate 2# 302 to provide operating space for the replacement of lip brick 7. Use insulation blanket 6 to seal and insulate the original position of gate 2# 302 in convection channel 1 to reduce heat loss. At the same time, electric heating rods and thermocouples can be installed here to achieve temperature control. Cover the lifted gate 2# 302 with insulation blanket 6 to prevent it from cracking when it is suddenly cooled or heated.

[0041] S4: From the observation window on one side of the tin bath 2, remove most of the residual molten glass from the front crossbeam brick 201 to the lip brick tongue 702 of the tin bath 2, leaving a small amount of molten glass to cover the exposed surface of the molten 10, preventing excessive oxidation and contamination of the molten 10. Furthermore, there is a large space below the front crossbeam brick 201 and the molten 10, allowing air to easily enter the tin bath 2 and cause oxidation and contamination of the molten 10. Therefore, to reduce contamination of the molten 10, such as... Figure 2 As shown, an aluminum silicate fiber blanket is installed between the lip brick tongue 702 and the front lintel brick 201. A support is installed below the aluminum silicate fiber blanket, which can be a cooling water pipe 9. Cooling water flows through the cooling water pipe 9. On the one hand, the cooling water pipe 9 can support the aluminum silicate fiber blanket, and on the other hand, the cooling water can cool the cooling water pipe 9 to prevent it from deforming due to heat and thus failing to support the aluminum silicate fiber blanket. The combination of the aluminum silicate fiber blanket and the support allows the heat from the tin bath 2 to insulate the V-shaped area 8 between the tin bath 2 and the lip brick 7. At the same time, the protective gas in the tin bath 2 can protect the molten tin 10 in the V-shaped area 8 from oxidation. In addition, any gaps or openings in the V-shaped area 8 can be sealed with the aluminum silicate fiber blanket.

[0042] S5: Lift out 0 shell 4 and begin preparations for the overall lifting of the old lip brick 7. Check whether the old lip brick 7 is stuck to the octagonal brick and backing brick at the inlet of the tin bath 2 (if stuck, use hooks or other tools to separate them). After confirming that there is no sticking, lift the old lip brick 7 and check whether the octagonal brick and backing brick at the inlet of the tin bath 2 need to be replaced. If they do not need to be replaced, protect them and reuse them. Do a good job of heat preservation at the end face of the connection between the flow channel 1 and the lip brick 7.

[0043] S6: Remove the glass stuck to the bottom and side walls of the flow channel 1 and the connection between the flow channel 1 and the lip brick 7, ensuring that there are no unevenness on the contact surface with the new lip brick 7, otherwise it will affect the installation quality of the new lip brick 7; after cleaning the glass, measure the distance between the two inner walls of the flow channel 1 to determine the center line of the flow channel 1.

[0044] S7: Hoist the new lip brick 7, level the lip brick 7 in the longitudinal and transverse directions, and adjust the gap between the lip brick 7 and the flow channel to be uniform in the upper and lower parts; the connection between the lip brick 7 and the flow channel 1 should not be higher than the flow channel 1, the center line of the lip brick 7 should be consistent with the center line of the flow channel 1, and use a frame level to measure whether the lip brick 7 is level. After the lip brick 7 is in place, it should be tightly attached to the flow channel 1 and fixed together with connecting bolts.

[0045] S8: Hoist 0B4 so that the lower end of 0B4 is 15-10mm higher than the lip brick bracket 701; install thermocouples at the connection between lip brick 7 and flow channel 1 and at the tongue of lip brick 702, with the thermocouples 5-10mm away from the surface of lip brick 7, so as to monitor the temperature rise of lip brick 7 later.

[0046] S9: The lip brick 7 is heated by the hot airflow in the tin bath 2, and then electrically heated to gradually increase its temperature. The heating process is as follows: first, the temperature is raised to 150℃, then to 350℃, and then to 720℃, with the heating rate increasing sequentially. The height of 0B4 is gradually reduced to control the heating rhythm according to the heating situation; the lip brick 7 is checked for any abnormalities every hour during the heating process.

[0047] S10: Restore 0 shell 4, install the lifting device of 2# gate 302, 2# gate 302 and pressure strip brick, cover brick, seal 0 shell 4, flow channel 1, lip brick 7 around, and prepare for the inlet.

[0048] This invention proposes a systematic online hot-state replacement method for the lip brick 7 of the flow channel 1. This method makes the hot-state replacement process of the lip brick 7 safer, more stable, and minimizes losses, thus effectively ensuring the quality of the finished product on the production line.

[0049] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A method for online hot-state replacement of flow channel lip bricks in float ultrathin electronic glass, characterized in that, Includes the following steps: S1: Lower gate 1 (301) and smash the head; after smashing the head, remove the electric heating rod of 0 shell (4) and take out the nitrogen bag at the inlet of tin bath (2), remove the pressure strip brick and cover brick between gate 1 (301) and gate 2 (302), push the cover brick (5) between gate 1 (301) and gate 2 (302) and the shoulder brick under the cover brick (5) towards gate 1 (301), and then use the heat insulation blanket (6) to seal and insulate the gap between gate 1 (301) and gate 2 (302); S2: Lift the 0-beam (4) upwards using the 0-beam (4) pull rod so that the distance between the upper end face of the lip brick bracket (701) and the 0-beam (4) is greater than 500mm. Remove the connecting bolts and solder joints between the lip brick bracket (701) and the flow channel (1). Move the lip brick (7) as a whole towards the tin bath (2) and install shims between the lip brick bracket (701) and the side brick of the tin bath (2). S3: Lift out gate #2 (302), remove the lifting device of gate #2 (302), and use insulation blanket (6) to seal and insulate the position of the original gate #2 (302) in the convection channel (1); S4: Clean the remaining molten glass from the front beam brick (201) to the tongue of the lip brick (702) of the tin bath (2) through the observation window on one side of the tin bath (2); S5: Lift out 0 shell (4), check whether the old lip brick (7) and the eight-character brick and backing brick at the entrance of the tin bath (2) are stuck together. After confirming that they are not stuck together, lift the old lip brick (7). S6: Remove the glass stuck to the bottom and side walls of the flow channel (1) and the connection between the flow channel (1) and the lip brick (7) to ensure that there is no unevenness on the contact surface with the new lip brick (7); after cleaning the glass, measure the distance between the two inner walls of the flow channel (1) to determine the center line of the flow channel (1); S7: Hoist the new lip brick (7). The connection between the lip brick (7) and the flow channel (1) is not higher than the flow channel (1). The center line of the lip brick (7) is consistent with the center line of the flow channel (1). Use a frame level to measure whether the lip brick (7) is level. After the lip brick (7) is in place, it is tightly attached to the flow channel (1) and fixed together with connecting bolts. S8: Hoist 0 shell (4) so ​​that the lower end face of 0 shell (4) is 5-10mm higher than the lip brick bracket (701); S9: The lip brick (7) is heated by the hot air flow in the tin bath (2), and then the lip brick (7) is heated by electric heating to gradually raise its temperature; the height of 0 B (4) is gradually reduced according to the heating situation to control the heating rhythm; S10: Restore 0 shell (4), install the lifting device of 2# gate (302), 2# gate (302) and pressure strip brick, cover brick, seal 0 shell (4), flow channel (1), lip brick (7) around, and prepare for the inlet; In step S1, before lowering gate 1 (301), the proportion of hydrogen in the protective gas at the front end of the tin bath (2) is increased to more than 10%.

2. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 1, characterized in that, In step S4, when cleaning the glass, a small portion of the molten glass is left to cover the exposed molten tin (10) surface to prevent excessive oxidation and contamination of the molten tin (10).

3. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 1, characterized in that, In step S4, an insulation blanket (6) is installed between the tongue of the lip brick (702) and the front beam brick (201) of the tin bath (2), and a support is installed below the insulation blanket (6).

4. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 3, characterized in that, The support component is a cooling water pipe (9).

5. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 1, characterized in that, In step S8, after hoisting the 0 shell (4), thermocouples are installed at the connection between the lip brick (7) and the flow channel (1) and at the tongue of the lip brick (702), with the thermocouples 5-10mm away from the surface of the lip brick (7).

6. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 1, characterized in that, In step S9, when the lip brick (7) is electrically heated, it is first heated to 150°C, then to 350°C, and then to 720°C, and the heating rate increases sequentially.

7. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 1, characterized in that, Before proceeding to step S1, prepare for the operation: one month before replacing the lip brick (7), place the lip brick (7) near the flow channel and heat the lip brick (7) with the heat of the flow channel to remove the moisture in the lip brick (7). After the moisture in the lip brick (7) is removed, assemble the lip brick (7) on the lip brick bracket (701) and test whether the electric hoist is normal.

8. The method for online hot replacement of flow channel lip bricks in float ultrathin electronic glass as described in claim 1, characterized in that, The thermal insulation blanket (6) is made of aluminum silicate fiber.

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